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M. G. COOK.

SPEEDOMETER.

APPLICATION FILED DEC-17.1913. RENEWED JAN. 15.1916.

1 ,1 94:, 1 44:. Patented Aug. 8, 1916.

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WTED STATES PATENT FFEQE.

MOSES G. COOK, F LYNN, MASSACHUSETTS.

SPEEDOMETER.

Application filed December 17, 1913, Serial No. 807,227.

more accurately disclosed; to means where-,

by the speed can be known to those too far away to distinguish thefigures on its dial;

and to improvements in details of construction herelnafter set forth.

Referring to the drawings forming part of this specification, Figure 1is an elevation of a speedometer embodying my improvements, with onewall broken away. Fig. 2 is a side central sectional elevation. Fig. 3is a sectional detail view. F ig. & is a detail view of otherparts.

For indicating the speed registered by this speedometer, I prefer toemploy a circular frame I mounted on a spindle 2 and adapted to carryseveral transparent sheets 3 of different colors. Such frame is stampedfrom sheet metal, as aluminum, and comprises a hub 4, spokes 5 and a rim6. WVhere the sheets or plates 3 are composed of transparent celluloid,they can be more readily attached to said frame, than when of glass.Said frame is adapted to be revolubly supported within a case 10,through each face' 11 of which is a window 12 corresponding somewhatclosely in general outline to a plate 3. For properly moving said indexframe 1,.its spindle 2 is put in control of a shaft 15 which is rotatedby power taken from moving parts of the automobile carrying the device,in any well known manner, said shaft being provided with a centrifugallyactuated mechanism adapted to partially rotate said spindle. Such acentrifugally actuated mechanism which I have found best suited for thepurpose, comprises two parallel disks 16 having fixed between them atdiametrically opposite points cross bars 17 serving both to rigidly joinsaid disks and to provide more or less of the weights upon whichcentrifugal energy can act. Said disks 16 are also united by a pin 19loosely penetrating their centers and rig- Patented Aug. 8, 1916.

Renewed January 15, 1916. Serial No. 72,371.

idly held by the shaft 15. Slidable upon said shaft and slotted to avoidsaid pin, is a sleeve 20 having a radially projecting lug 21 from whichextends a screw 22 carrying at its outer end a small cross arm 23terminally engaging the radial slots 24 formed in said disks.Consequently, when under the influence of centrifugal energy the ClOSsbars 17 and additional weights l3 swing said disks through a limitedarc, the screw 22 and sleeve 20 are moved downward thereby a shortdistance. Upon a. reduced upper portion 25 of said sleeve and retainedthereon by a collar 26, is a second sleeve 27 bearlng a rack 29 whichmeshes with a pinion 3O fixed upon said spindle 2. Hence, as said sleeve20 rises and falls, said rack moves therewith and rotates said spindleand the frame 2 carried by the latter, but said racksleeve beingrotatively supported by the sleeve 20, does not turn with the latter butremains in perfect mesh with said pinion. To insure the same, therack-sleeve 27 is formed with two lugs 31 loosely embracing the guiderod 32. For counterbalancing said sleeves and connected parts, a secondpinion 33 is mounted on the spindle 2, and a tubular weight 34 providedwhich carries a rack 35 meshing with said pinion 33. A fixed rod 36slidably guides said weight, and lugs 37 and fixed rod 38 to keep thesame from turning and throwing said rack out of mesh with the pinion 33.For returning said disks and connected parts to their positions of rest,a tension spring 39 has its ends attached to a collar 40 on the shaft15, and to an adjusting member ll on one of the weight-bars 17 Byproperly adjusting the tension of this spring, the centrifugallyoperated devices are adapted to turn the spindle2 and frame 1 accuratelyto designate the speed of the automobile. A more delicate adjustment forthe purpose is given by the screw 22 which rotatably bears the cross arm23. By turning said screw in or out of its boss or lug 21, said crossarm is made to bear upon shorter or longer radii of the disks, and henceto correspondingly affect the power transmitted by the disks to the rackbar and indicator frame 1.

In order that the slots 24 shall not affect the centrifugal action ofthe weights 17, 18, a second slot 42 is cut in each disk diametricallyopposite said slots 24; and in order that these slots 24 and 42 shall beincapable of affecting the centrifugal action, two other slots 43 areformed in each disk diametrically opposite to each other and at pointsninety degrees away from the first-named slots.

A screw 14 is tapped through a cross bar 17 to be met by the boss 21 atone limit of the disks movements.

In Fig. 1, the frame 1 is represented as displaying two differentlycolored plates 3 between the two windows 12 (Fig. 2) one color beingselected to designate one range of speeds, and the other another range.I prefer to have white or clear transparent designate a range of speedsbetween zero and 10 miles per hour; to have green designate between 10and 20; yellow between 20 and 30; red, between 30 and to, while acompletion of the circle to present white again designates between 40and 50 miles an hour. If nothing but a single color can be seen throughthe window, then the full limit of speed associated with such color isdesignated. That is, if only red can be seen, a speed of 10 miles anhour is indicated, since red stands for speeds between 30 and A0 milesper hour. If, however, two colors are exposed, as in Fig. 1 which showthe conventional lines representative of green and yellow respectively,then the speed indicated is past the higher limit of the green (20) andpartly in the yellow whose lower limit is 20. If the spoke 5 ispositioned at the center of the window 12, the speed indicated is 25miles per hour, but in the position shown in Fig. 1, the speed is but 28miles an hour. For the readier perception of the units thus referred to,the upper edge of the window 12 is formed with serrations nine innumber, each carrying its proper numeral.

What I claim is:

1. A speedometer comprising a rotary member provided with differentlycolored sections designed to be indicative of different ranges of speed,means controlled by the speed of the conveyance carrying the speedometerfor turning said member, and a case inclosing said member, said casehaving a window substantially equal in dimensions to one of saidsections, an edge of said window being formed with nine serrations eachhearing one of the nine digits.

2. A speedometer comprising an indicating means, a vertical shaftadapted to be revolved by the body whose speed is to be measured, arotary member having its axis of rotation transverse to and carried bysaid shaft, weights carried by said member, a sleeve slidable on saidshaft, a rack carried by said sleeve, a spindle connected with saidindicating means, two pinions on said spindle, one meshing with saidrack, and a second weighted rack meshing with the other of said pinionsfor counterweighting said sleeve.

3. A speedometer comprising an indicating means, a shaft adapted to berevolved by the body whose speed is to be measured, two parallel diskshaving a common axis transverse to and carried by said shaft, twooppositely disposed heavy cross bars rigid with said disks, and meanswhereby the centrifugally engendered partial rotation of said disks ontheir common axis is communicated to said indicating means.

4. A speedometer comprising a rotative indicating means, a shaft adaptedto be re volved by the body whose speed is to be measured, two paralleldisks having a common axis transverse to and carried by said shaft, twooppositely disposed heavy cross bars rigid with said disks, and twooppositely disposed weights on the outer surface of each disk, and meanswhereby the centrifugally engendered partial rotation of said disks ontheir common axis is communicated to said indicating means. a

5. A speedometer comprising a rotative indicating means, a shaft adaptedto be re volved by the body whose speed is to be measured, two paralleldisks having a common axis transverse to and carried by said shaft,weights carried by said disks at opposite points of their peripheries, asleeve slidable on said shaft, a radially disposed screw carried by saidsleeve, a cross arm terminally supported by said screw, said diskshaving each a radial slot receiving an end of said cross arm, and meansfor turning said indicating means actuated through the recipro-' cationof said sleeve.

6. A speedometer comprising an indicating means, a shaft adapted to berevolved by the moving body whose speed is to be measured, a sleeveslidable on said shaft, two parallel disks having a common axistransverse to and carried by said shaft, oppositely disposed weightscarried by said disks, four uniformly disposed radial slots being formedin the periphery of each disk, means engaging two of said slots wherebythe par tial turn of said disks on their axis slides said sleeve on saidshaft, yielding means acting on said disks in opposition to the effectof centrifugal energy thereon, and means whereby the movements of saidsleeve are adapted to actuate said indicating means.

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 16th day of December, 1913.

MOSES G. COOK.

Witnesses:

A. 'B. UPHAM, JOSEPH W. Downs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

